package chapter10;

import java.sql.*;

public class Example01 {
    public static void main(String[] args) throws SQLException {
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            //1.注册数据库的驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.通过 DriverManager获取数据库链接
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, username, password);
            //3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            //4.使用Statement执行SQL语句
            String sql = "select * from users";
            rs = stmt.executeQuery(sql);
            //5.操作ResultSet结果集
            System.out.println("id |  name |  password" +
                    "|  email    |  birthday");
            while (rs.next()) {
                int id = rs.getInt("id");//通过列名获取指定字段的值
                String name = rs.getString("name");
                String psw = rs.getString("password");
                String email = rs.getString("email");
                Date birthday = rs.getDate("birthday");
                System.out.println(id + "   |   " + name + "  |   " + psw +
                        "   |    " + email + "  |   " + birthday);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            //6.回收数据库资源
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}
